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If $$\sin \theta = \frac{{{p^2} - 1}}{{{p^2} + 1}},$$ then cosθ is equal to:
Answer & Solution
Correct Answer:
Option
A
$$\eqalign{
& \sin \theta = \frac{{{p^2} - 1}}{{{p^2} + 1}} \cr
& {\text{Let }}p = 2 \cr} $$
$$\eqalign{ & {\text{Now from option A}} \cr & \frac{{2 \times 2}}{{1 + 4}} = \frac{4}{5} \cr} $$
$$\eqalign{ & {\text{Now from option A}} \cr & \frac{{2 \times 2}}{{1 + 4}} = \frac{4}{5} \cr} $$
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